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Figure 3 13. Generating the test code from the transformed UML test classes
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Figure 3 14. The six new controller test classes in Eclipse
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Here s the complete generated controller test code for ValidatePasswordSyntaxTest. package com.softwarereality.login; import org.junit.*; import static org.junit.Assert.*; public class ValidatePasswordSyntaxTest { @Before public void setUp() throws Exception{ } @After public void tearDown() throws Exception{ } /** * The 'sunny day' scenario * * @input "MyPassword123" * @AcceptanceCriteria Validation passes. */ @Test public void defaultRunScenario() throws Exception{ } /** * @input "mylowercasepassword" * @AcceptanceCriteria Validation fails. */ @Test public void allLowerCaseShouldFail() throws Exception{ } /** * @input "MYUPPERCASEPASSWORD123" * @AcceptanceCriteria Validation fails. */ @Test public void allUpperCaseShouldFail() throws Exception{ } /** * @input "no-numbers" * @AcceptanceCriteria Validation fails. */ @Test public void nonNumericShouldFail() throws Exception{
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} /** * Minimum 6 characters. * * @input "Ab123" * @AcceptanceCriteria Validation fails. */ @Test public void shortPasswordShouldFail() throws Exception{ } } Obviously there are gaps in the generated code where a programmer needs to hook up the tests with the code under test; but each test method is annotated with the input (values required when setting up the text fixtures); the acceptance criteria can go straight into the assert... statements. We ll return to the test code later in this chapter; first, we need to complete the design and identify unit tests to cover any code not already covered by the controller tests.
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Step 6: Draw a Sequence Diagram
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By this stage our Login use case is in pretty good shape. You have a set of requirements tests that QA can own, a set of controller test cases and the generated code that just needs the blanks filled in, and you have a conceptual design (the robustness diagram in Figure 3 5) from which to drive the detailed design and the code. The next step is to create a detailed design: the point of this step is to really start thinking hard about the implementation details, and to identify any further tests that can be created, which aren t already covered by the controller tests. To do the detailed design, create a sequence diagram based on the robustness diagram in Figure 3 5. The initial step for the sequence diagram is quite formulaic, so with the help of our Agile/ICONIX add-in, EA can do this bit for you. (If you re using a different UML modeling tool, it doesn t take long to quickly draw this bit, though it s a fairly robotic process: put the use case text in a note, and copy the actor(s) and all the nouns entity and boundary objects onto the new diagram.) Within EA, simply right-click the robustness diagram and choose Create Sequence from Robustness. The result a new diagram with the use case note, actor, and all the entity and boundary objects copied over from the robustness diagram is shown in Figure 3 15.
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Figure 3 15. The (not-so-blank) sequence diagram that EA creates as a starting point from your robustness diagram
Note If you've noticed that we're still forgetting to lock the account in Figures 3-15 and 3-16, you've won a pork pie for catching our mistake... and incidentally demonstrated why a careful review of the conceptual design is so important before proceeding with detailed design. These sorts of mistakes are incredibly easy to make, and even authors aren't immune to them. It's worth noting that writing a unit test for all the methods in the detailed design and getting a green bar would completely miss this sort of 'error by omission'. We've got a whole chapter on conceptual design reviews in Use Case Driven Object Modeling With UML - Theory and Practice.
CHAPTER 3 HELLO WORLD! USING DDT
The design session itself must be led by the programmers. The final design should be thoroughly grounded in reality, with all the nitty-gritty implementation details discussed and factored into the sequence diagram. The basic guideline is to draw the controllers onto the sequence diagrams as operations/methods; however, this is only a guideline to get you started while you re allocating behavior to the objects on the sequence diagram, the main thing is to keep it real. If there are classes and operations involved that weren t in the conceptual design, make sure they re added in now.
Note There will be more about the detailed design stage and writing unit tests based on the design in 5.
Figure 3 16 shows the result (we ve omitted the use case note from the diagram to fit it on the page). To keep the example consistent with the TDD example from 2, this version also delegates the user credentials checking to an SSO service over encrypted HTTP. Notice how the method names in the sequence diagram mostly match up with the controller names from the robustness diagram. This is useful, as it means you can check the methods identified on the sequence diagram with the controller names to identify which methods on the sequence diagram are already covered by tests, and which ones are shockingly exposed. That brings us to the next stage now that you have your detailed design, it s time to add the unit tests.
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